Transmission housing

Abstract

The invention relates to a transmission housing, comprising a first interior space, which is provided as a lubricant space and is provided for accommodating components of a transmission, in particular a starting element and / or an electric machine of the transmission, and a second interior space (9), which is provided as a lubricant space and is provided for accommodating components of the transmission, in particular a starting element and / or an electric machine of the transmission, the second interior space is separated from the first interior space and is designed in a vertically upper region of the transmission housing in the mounted position of the transmission housing. A ventilation opening (34) is introduced into the second interior (9), which ventilation opening is designed to establish a connection between the second interior (9) and the ventilation device, the second interior (9) being directly connected to the first interior via a first passage (36), and the second interior (9) being directly connected to the first passage (36) via a second passage (36). The first passage is formed in the region of a vertically lower end of the second interior (9) in the mounted position of the transmission housing. Furthermore, a second passage (38) is provided, which directly connects the second interior space (9) to the first interior space (7) and is formed in a vertically upper region of the second interior space (9) in the mounted position of the transmission housing (6).

Description

Technical Field

[0001] The invention relates to a transmission housing, which comprises a first interior space and a second interior space, wherein the first interior space is provided as a lubricant space and is provided for accommodating components of the transmission, in particular a starting element and / or an electric motor of the transmission, and the second interior space is separated from the first interior space and is designed in a vertically upper region of the transmission housing in the installed position of the transmission housing, wherein a ventilation opening is guided into the second interior space, the ventilation opening is provided for establishing a connection between the second interior space and a ventilation device, and wherein the second interior space is directly connected to the first interior space via a first through-portion, which is constructed in the region of a vertically lower end of the second interior space in the installed position of the transmission housing. The invention also relates to a transmission having the above-mentioned transmission housing. Background Art

[0002] The transmission housing is usually equipped with a ventilation device, via which an air exchange with the surrounding environment can be achieved in the corresponding transmission housing, in order to prevent the formation of an overpressure in the corresponding interior of the transmission housing, which is caused by temperature changes in the corresponding interior and in particular by temperature changes of the lubricant located there. It must be ensured by the corresponding ventilation device that although air exchange and thus ventilation of the transmission housing can take place, lubricant cannot escape from the interior of the transmission housing via the ventilation device and that dirt cannot enter the transmission housing as far as possible. In addition, a divided interior space is usually connected to the transmission housing upstream of the ventilation device, in which the lubricant that has entered should be helped to settle down and thus defoamed, so that in the subsequent process, as far as possible, only air can be guided to the ventilation device.

[0003] DE 10 2017 121 056 A1 discloses a transmission housing in which a first interior space and a second interior space are designed. The first interior space is used to accommodate components of the relevant transmission and is designed as a lubricant space, because lubricant in the form of oil is present here, and the lubricant is also stirred up during the continuous operation of the transmission. A bowl-shaped oil collecting element is also provided on the end side of the housing part of the transmission housing that defines the first interior space, and the oil collecting element is used to collect the stirred oil and deflect it in the direction of the first interior space. The oil collecting element, together with other housing parts of the transmission housing, defines the second interior space of the transmission housing, wherein, in the installed position of the transmission housing, the second interior space is constructed in the vertical upper region of the transmission housing and is connected to the first interior space via a through-portion. In the installed position of the transmission housing, a through-hole is formed in the region of the vertically lower end of the second interior space in order to allow the stirred-up oil to enter the second interior space acting as a calming space, wherein the oil can also flow back into the first interior space via the same through-hole. The second interior space is also connected to the ventilation of the transmission housing via the ventilation opening. Summary of the invention

[0004] Based on the above-mentioned prior art, the object of the present invention is now to provide a transmission housing in which an unintentional flow of lubricant in the direction of the ventilation device is prevented in the most reliable manner possible.

[0005] This object is achieved based on the preamble of claim 1 in combination with its characterizing features. The following dependent claims each reflect advantageous developments of the invention. Furthermore, a transmission in which a transmission housing according to the invention is arranged is the subject of claim 10.

[0006] According to the present invention, the transmission housing comprises a first interior space and a second interior space, wherein the first interior space is provided as a lubricant space and is provided for accommodating components of the transmission, in particular a starting element and / or a motor of the transmission, and the second interior space is separated from the first interior space and is designed in the vertically upper region of the transmission housing in the installation position of the transmission housing. A ventilation opening is guided into the second interior space, and the ventilation opening is provided for establishing a connection between the second interior space and the ventilation device. In addition, the second interior space is directly connected to the first interior space via a first through-portion, which is constructed in the region of the vertically lower end of the second interior space in the installation position of the transmission housing.

[0007] According to the invention, the transmission housing thus has a first interior space and a second interior space, the second interior space being spatially separated from the first interior space, that is to say being spatially divided from the first interior space. Preferably, however, the transmission housing according to the invention has, in addition to the first interior space and the second interior space, one or more further interior spaces which are divided from the first interior space and the second interior space.

[0008] The first interior space of the transmission housing according to the invention is designed to accommodate components of the transmission. In particular, the first interior space is designed to accommodate starting elements of the transmission, such as a starting clutch, a dual clutch, a torque converter or the like and / or an electric machine. Furthermore, the first interior space is designed as a lubricant space, which in the sense of the invention is understood to be a space in which a lubricant is present or can be present.

[0009] In the installed position of the transmission housing, that is to say, in the position of the transmission housing when the transmission is completely assembled and installed, the second interior space is arranged in the upper region of the transmission housing in the vertical direction, wherein the second interior space is preferably used as a calming space for the lubricant and in particular for defoaming the lubricant. On the one hand, a ventilation opening opens into the second interior space, which is arranged to connect the second interior space to a ventilation device. Therefore, the ventilation opening is preferably used to exchange air between the second interior space and the ventilation device in order to ventilate the second interior space. In this case, in particular, the ventilation device is also part of the transmission housing and is preferably arranged to exchange gas and in particular air between the surroundings of the transmission housing and the inner region of the transmission housing.

[0010] Furthermore, the first interior space and the second interior space are directly connected via a first through-hole, which in the installed position of the transmission housing is designed in the region of the vertically lower and therefore vertically lower end of the second interior space. Lubricant and air can pass from the first interior space into the second interior space via the first through-hole, so that, in addition to possible defoaming of the lubricant in the second interior space, ventilation of the first interior space via the second interior space and again via the ventilation opening can also take place. In this case, the first through-hole connects the first interior space and the second interior space directly, that is to say directly and without further intermediate spaces.

[0011] Furthermore, since the first through-hole is also arranged in the region of the vertically lower end of the second interior space, the lubricant can also flow back from the second interior space into the first interior space. In the sense of the present invention, the "vertically lower end" of the second interior space is to be understood in particular as the vertically lowermost end of the second interior space in the installed position of the transmission housing. Particularly preferably, the first through-hole is configured here exactly at the vertically lower end of the second interior space, so that the first through-hole connects the first interior space and the second interior space to each other at the vertically lowermost point of the second interior space in the installed position of the transmission housing. This facilitates the return of the lubricant from the second interior space into the first interior space.

[0012] The present invention now includes the following technical teaching, namely, a second through-hole is also provided, which directly connects the second interior space and the first interior space and is configured in the installed position of the transmission housing in the vertically upper region of the second interior space. In other words, the first interior space and the second interior space are therefore also directly connected to each other via the second through-hole, wherein the second through-hole is configured in the installed position of the transmission housing and in the vertical direction in the region above the second interior space.

[0013] This design of the transmission housing has the advantage that even in the case of a first through-hole completely closed by lubricant, a pressure balance between the second interior space and the first interior space can be achieved via the further second through-hole. This prevents an overpressure in the second interior space, which could otherwise lead to lubricant being transported into the ventilation opening and thus also into the ventilation device of the transmission housing. Since the second through-hole is also designed in the vertically upper region of the second interior space in the installation position of the transmission housing, the risk of the second through-hole also being clogged with lubricant in this region is very low, even in the case of a high load on the relevant transmission and a large amount of stirred-up lubricant. Thus, with the transmission housing according to the invention, reliable ventilation can be achieved and at the same time, unintentional entry of lubricant into the ventilation opening and thus into the region of the ventilation device is prevented.

[0014] In contrast, in DE 10 2017 121 056 A1, the connection between the two interior spaces is established only via a through-hole, through which the stirred-up lubricant from the first interior space can enter the second interior space, which functions as a calming space. However, in the case of a large amount of stirred-up lubricant, it may happen that the through-hole is blocked by the lubricant and an overpressure may occur in the second interior space. This overpressure may cause the lubricant to be transported to the ventilation device connected to the second interior space.

[0015] Furthermore, according to one embodiment of the present invention, a third through-hole is provided, which directly connects the second interior space to the first interior space. This further facilitates pressure balance with the first interior space and facilitates the flow of air from the first interior space to the ventilation device. Particularly preferably, the third through-hole is configured vertically in the region between the first through-hole and the second through-hole in the installed position of the transmission housing.

[0016] According to an alternative or supplementary design possibility of the invention, the first housing part is formed with a notch-shaped recess, the periphery of which is defined by a surrounding contact surface. Here, the second housing part is placed on the first housing part at the contact surface of the first housing part and forms a second interior space between them together with the recess of the first housing part. This has the advantage that the second interior space can be defined between the two housing parts in a simple manner and thus also with low manufacturing effort.

[0017] In a refinement of the above-mentioned design possibility, the first through-hole and / or the second through-hole and / or the third through-hole are each defined by a groove, which is respectively introduced into the contact surface of the first housing part. As a result, the individual grooves can be produced in an advantageous manner with low production costs. Preferably, all through-holes which directly connect the first interior space to the second interior space are designed as grooves introduced into the contact surface.

[0018] Alternatively or in addition thereto, the ventilation opening is introduced as a hole into the bottom of the notch-shaped depression of the first housing part. This also enables the ventilation opening to be produced with low manufacturing effort.

[0019] Alternatively or additionally, the first housing part is an intermediate plate, by which the first interior of the transmission housing is separated from a third interior, which is provided as a lubrication space and is provided for accommodating further components of the transmission, in particular a gear set of the transmission. Preferably, a ventilation aperture is introduced into the intermediate plate, via which the third interior is connected to the first interior. In particular, a bearing point for a bearing of an intermediate gear of a spur gear transmission is provided on the intermediate plate, which spur gear transmission is preferably provided as a pump drive for an oil pump of the transmission.

[0020] Furthermore, an alternative or supplementary improvement of this design possibility is that the second housing part is a plate which is fastened to the first housing part. Thus, the second housing part can be produced with low manufacturing effort due to its substantially flat structure.

[0021] According to an advantageous embodiment of the invention, the second interior space is formed by a plurality of chambers which are connected to one another via narrowed areas, wherein the second through-hole is arranged in a chamber which is vertically above in the installed position of the transmission housing. Particularly preferably, the second through-hole is arranged in a chamber which is adjacent to an end-side chamber which is designed laterally at the end of the second interior space and vertically above in the installed position of the transmission housing. Furthermore, if a third through-hole is also provided, the third through-hole is particularly preferably designed in the end-side chamber.

[0022] The subject matter of the invention is also a transmission, in particular a motor vehicle transmission, and having a transmission housing according to one or more of the above-described variants. In this case, in particular the starting element and / or the electric motor are accommodated in a first interior space of the transmission housing, the first interior space being connected directly to the second interior space via a through-hole and indirectly also to the ventilation device via the second interior space, while the gear set of the transmission is preferably accommodated in a third interior space of the transmission housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The advantageous embodiments of the invention explained below are shown in the accompanying drawings. In which:

[0024] Figure 1 A schematic view of a transmission having a transmission housing according to a preferred embodiment of the present invention is shown;

[0025] Figures 2 to 4 Shows Figure 1 A perspective view of a portion of the transmission housing. DETAILED DESCRIPTION

[0026] Depend on Figure 1 A schematic view of a transmission 1 is shown, which is in particular a motor vehicle transmission. The transmission 1 comprises a starting element 2 and a gear set 3, which are arranged between a drive shaft 4 and an output shaft 5 and are accommodated in a transmission housing 6 of the transmission 1. The transmission housing 6 is designed according to a preferred embodiment of the invention and consists of a plurality of individual parts, which define a plurality of interior spaces 7, 8, 9 and 10 of the transmission housing 6. The starting element 2 is accommodated in the interior space 7, which is spatially separated from the interior space 8 by a housing part 11 in the form of an intermediate plate 12, wherein the gear set 3 of the transmission 1 is arranged in the interior space 8.

[0027] The starting element 2 is in the form of a hydrodynamic torque converter 13, which is located axially upstream of the downstream gear set 3 within the transmission 1. The hydrodynamic torque converter 13 consists of a turbine 14, a pump wheel 15 and a stator 16, which are each provided with blades in a manner known in principle to a person skilled in the art and which delimit an annular space 17 between them. The stator 16 is connected to the intermediate plate 12 via a centrally located freewheel 18, while the pump wheel 15 is permanently connected to the input shaft 19 of the downstream gear set 3 in a rotationally fixed manner.

[0028] In addition, the turbine 14 is permanently connected to the drive shaft 4 in a rotationally fixed manner, wherein the turbine 14 can preferably also be connected to the pump wheel 15 in a rotationally fixed manner via a torque converter lockup clutch (not shown at the moment), which will also result in the drive shaft 4 being connected to the input shaft 19 in a rotationally fixed manner and thus resulting in a bridging of the torque converter 13.

[0029] The drive shaft 4 is also connected in a rotationally fixed manner to a spur gear 20 of a spur gear stage 21, wherein the spur gear 20 inside the spur gear stage 21 is permanently in tooth engagement with an intermediate gear 22, which is rotatably supported on a bearing point 23 of the intermediate plate 12. The intermediate gear 22 is also in permanent meshing engagement with a further spur gear 24 of the spur gear stage 21, which is arranged in a rotationally fixed manner on a pump drive shaft 25 of a lubricant pump 26 of the transmission 1. In this respect, the lubricant pump 26 can be driven via the drive shaft 4 by means of the centrally located spur gear stage 21.

[0030] The lubricant pump 26 is arranged in a lubricant sump 27 of the housing 6, which is essentially formed by the interior 10, and is immersed there in the lubricant located there, in order to draw up the lubricant during operation and to conduct it to the corresponding areas of the transmission 1 for lubrication and / or cooling of the components located there. In particular, a supply to the annular space 17 of the torque converter 13 also takes place here. In addition to the interior 10, the interiors 7 and 8 of the transmission housing 6 are also present as lubricant spaces, i.e., lubricant is present therein.

[0031] A ventilation device 28 is also provided on the transmission housing 6, via which air exchange with the surroundings of the transmission housing 6 can be carried out in order to prevent overpressure in the interior spaces 7 to 10, especially caused by temperature. The ventilation device 28 is connected to the interior space 9 via a connecting channel 29 extending in the transmission housing 6, so that air from the interior space 9 can be guided to the ventilation device 28. Here, the interior space 9 is used as a calming space to defoam the lubricant entering from the interior space 7 and indirectly for ventilating the interior space 7. In addition, the interior space 8 is also connected to the interior space 7 via a ventilation passage 30 in the form of a hole, so that the interior space 8 can also be ventilated indirectly via the interior spaces 7 and 9 by means of the ventilation device 28.

[0032] like Figure 1 As pointed out and especially in Figures 2 to 4 As can be seen in FIG. 1 , the interior space 9 is formed by a notch-shaped depression 31 of the intermediate plate 12 and a housing part 32 which is attached to the intermediate plate 12 in the region of the depression 31 and which is present here as a plate. The housing part 32 rests on a support surface 33 which defines the periphery of the depression 31 and is provided at the intermediate plate 12. Figures 2 to 4 It can be seen at least in part in Figures 2 to 4 Also visible in the figure is a ventilation opening 34 which is introduced as a hole into the bottom 35 of the depression 31 and which establishes a connection between the interior space 9 and the connecting channel 29 .

[0033] In the installation position of the transmission housing 6 (such as Figure 1 and Figure 2 In the embodiment shown in the figure, the interior space 9 is designed in the vertical upper region of the transmission housing 6. The interior space 9 is directly connected to the interior space 7 via three through-holes 36, 37 and 38, which are respectively connected to the interior space 7. Figure 3 3 and are introduced as grooves 39, 40 and 41 in the support surface 33 of the intermediate plate 12. In the installed position of the transmission housing 6, the through-opening 36 is designed at the vertical lower end 42 of the interior space 9 in order to ensure not only an air exchange between the interior space 7 and the interior space 9 but also a reliable return of the lubricant entering the interior space 9 into the interior space 7.

[0034] In the installed position of the transmission housing 6, the aperture 37 is arranged at a lateral end 43 of the interior 9, wherein the end 43 is laterally opposite a lateral end 44 in the region of which the aperture 36 is arranged. In the installed position of the transmission housing 6 and in the vertical direction, the aperture 37 is arranged between the aperture 36 and the aperture 38 which likewise directly connects the interior 9 to the interior 7. The two apertures 37 and 38 are also used here for the exchange of air between the interior 7 and the interior 9, so that the air can also be exchanged with the ventilation device 28 via the ventilation opening 34.

[0035] Here, in the installed position of the transmission housing 6, the through-portion 38 is designed in the vertically upper area of ​​the interior space 9, whereby even when the other two through-portions 36 and 37 are closed by lubricant, pressure balance between the interior space 7 and the interior space 9 can be achieved via the through-portion 38, thereby preventing the lubricant entering the interior space 9 from being accidentally transported in the direction of the ventilation device 28.

[0036] As in Figures 2 to 4 As can be seen in the figure, the interior space 9 consists of a plurality of chambers 45 to 48, which are connected to each other and delimited via narrowings 49 to 51. The narrowings 49 to 51 are present here due to the screwing points 52 of the intermediate plate 12. The through-hole 36 connects the chamber 45 of the interior space 9 with the interior space 7, wherein the chamber 45 is then connected to the chamber 46 via the narrowing 49, and then the chamber is in turn connected to the chamber 47 via the narrowing 50. Then, the ventilation opening 34 is provided in the chamber 47, and a further connection of the interior space 9 with the interior space 7 is established via the through-hole 38. Here, the through-hole 38 is constructed at the region of the chamber 47 which is vertically the uppermost in the installation position of the transmission housing 6. In addition, the chamber 47 is connected to the chamber 48 via the narrowing 51, wherein the chamber 48 is also directly connected to the interior space 7 via the through-hole 37.

[0037] The embodiment of the transmission housing according to the invention makes it possible to achieve reliable ventilation and, moreover, prevent an undesired flow of lubricant in the direction of the ventilation device.

[0038] Reference numerals list

[0039] 1 Transmission

[0040] 2Starting element

[0041] 3 Gear Set

[0042] 4 drive shaft

[0043] 5 Output shaft

[0044] 6 Transmission housing

[0045] 7. Internal Space

[0046] 8. Internal Space

[0047] 9. Internal Space

[0048] 10. Interior Space

[0049] 11 Shell part

[0050] 12 Middle plate

[0051] 13Torque converter

[0052] 14 Turbine

[0053] 15 Pump wheel

[0054] 16 guide wheel

[0055] 17 Ring Space

[0056] 18 one-way clutch

[0057] 19 Input shaft

[0058] 20 cylindrical gear

[0059] 21 cylindrical gear stages

[0060] 22 Intermediate gear

[0061] 23 support points

[0062] 24 cylindrical gear

[0063] 25 Pump drive shaft

[0064] 26 Lubricant pump

[0065] 27 Lubricant sump

[0066] 28 Ventilation device

[0067] 29 connection channels

[0068] 30 ventilation through-hole

[0069] 31 Depression

[0070] 32 Shell part

[0071] 33 rest surface

[0072] 34 ventilation openings

[0073] 35 bottom

[0074] 36 through-section

[0075] 37Through

[0076] 38 through-section

[0077] 39 slots

[0078] 40 slots

[0079] 41 slots

[0080] 42 end

[0081] 43 end

[0082] 44 end

[0083] 45 chambers

[0084] 46 chambers

[0085] 47 Chamber

[0086] 48 chambers

[0087] 49 Stenosis

[0088] 50Narrow parts

[0089] 51 Stenosis

[0090] 52 screw connection

Claims

1. A transmission housing (6), comprising a first interior space (7) and a second interior space (9), the first interior space being arranged as a lubricant space and being arranged for accommodating components of a transmission (1), in particular a starting element (2) and / or an electric motor of the transmission (1), the second interior space being separated from the first interior space (7) and being arranged in a vertically upper region of the transmission housing (6) in the installed position of the transmission housing (6), wherein: A ventilation opening (34) is guided into the second interior space (9), the ventilation opening being designed to establish a connection between the second interior space (9) and the ventilation device (28), wherein the second interior space (9) is directly connected to the first interior space (7) via a first through-portion (36), the first through-portion being constructed in the installation position of the transmission housing (6) in the region of a vertically lower end of the second interior space (9), characterized in that a second through-portion (38) is also provided, the second through-portion directly connecting the second interior space (9) to the first interior space (7) and being constructed in the installation position of the transmission housing (6) in the region of a vertically upper end of the second interior space (9).

2. The transmission housing (6) according to claim 1, characterized in that A third through-hole (37) is also provided, and the third through-hole directly connects the second internal space (9) and the first internal space (7).

3. The transmission housing (6) according to claim 1 or 2, characterized in that The first housing part (11) forms a notch-shaped recess (31), the periphery of which is defined by a surrounding abutment surface (33), wherein the second housing part (32) is mounted on the first housing part (11) at the abutment surface (33) of the first housing part (11) and together with the recess (31) of the first housing part (11) forms the second interior space (9) therebetween.

4. The transmission housing (6) according to claim 3, characterized in that The first aperture (36) and / or the second aperture (38) and / or the third aperture (37) are each defined by a groove (39, 40, 41) which is introduced into a contact surface (33) of the first housing part (11).

5. The transmission housing (6) according to claim 3 or 4, characterized in that The ventilation opening (34) is introduced as a hole into a bottom (35) of a notch-like depression (31) of the first housing part (11).

6. The transmission housing (6) according to any one of claims 3 to 5, characterized in that The first housing part (11) is an intermediate plate (12), and the first interior space (7) of the transmission housing (6) is separated from the third interior space (8) by the intermediate plate, and the third interior space is arranged as a lubricant space and is arranged to accommodate other components of the transmission (1), in particular the gear set (3) of the transmission (1).

7. The transmission housing (6) according to claim 6, characterized in that A ventilation aperture (30) is introduced into the intermediate plate (12), and the third interior space (8) is connected to the first interior space (7) via the ventilation aperture.

8. The transmission housing (6) according to any one of claims 3 to 7, characterized in that The second housing part (32) is a plate fastened to the first housing part (11).

9. The transmission housing (6) according to any one of the preceding claims, characterized in that The second interior space (9) is formed by a plurality of chambers (45, 46, 47, 48) which are connected to one another via narrowed areas (49, 50, 51), wherein the second passage (38) is arranged in the chamber (47) which is vertically above in the installed position of the transmission housing (6).

10. A transmission (1), in particular a motor vehicle transmission, comprising a transmission housing (6) according to one or more of claims 1 to 9.

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